Over 4.5 billion.
During World War I and World War II, gas masks were issued to British soldiers, civilians, and children as a protective measure against chemical warfare. The government provided these masks to ensure public safety in the event of gas attacks, particularly during the Blitz in World War II. Additionally, various organizations and schools conducted drills to familiarize people with their use. The iconic "British Mk IV gas mask" became a symbol of the era.
Cold war era gas masks are easily available from Military surplus stores and ebay. Modern gas masks can be bought from specialist suppliers. Examples include places like rddusa.com or armygasmasks.com
The words tummy and belly were used during the world war 2 era.
potter
the dynasaur era
The Yankees have won seven World Series in the free agent era.1977, 1978, 1996, 1998, 1999, 2000, 2009
Edwardian era or World War 1
Four post Super Bowl era
No, because they existed 230 million years ago in the Mesozoic era.
C.E. is often used to mean Common Era. Others use the term A.D. But we live in a large and diverse world and many people don't see Christ as the starting point for a calendar. Instead of B.C., B.C.E is used.
Late Edwardian era, the First World War era, and the Inter-war era.
Four post Super Bowl era